AND THEIR ESSENTIAL OILS. 31 



between 156-157 C. It had a marked odour resembling 

 ordinary turpentine; specific gravity at 15 C. = 0*8661; 

 rotation a D 38*1: and refractive index at 18 

 = T4659. The nitrosochloride was easily prepared with 

 it, and this melted at the correct temperature. It may be 

 assumed, therefore, that 50 or 60 per cent, of the oil of 

 this Eucalyptus consists of laevo-rotatory pinene, and this 

 is confirmed by both the Monga and Muloon samples. 

 Whilst the chief constituent of the oil is pinene, that of the 

 oil of E '. coriacea is phellandrene. 



EUCALYPTUS REGNANS, F. v. M. 

 f" Swamp Gum.") 



[SYN. : E. gigantea, Hook. f. (" Fl. Tas."), partim. 



E. gigantea, Hook. f. (" Lond. Journ. Bot." VI. 

 479. 1847), partim. See remarks under E. 

 obliqua, this paper.] 



BOTANY. 



Historical. This Eucalyptus was first brought under the 

 notice of the scientific world by Baron von Mueller in 

 1870 (Report of Ace. Soc. Viet. 7th Rep., p. 48). 

 Although included by Mueller under E. amygdalina in 

 his " Eucalyptographia " when referring to the giant trees 

 of the Dandenong Ranges, yet he did not give a full 

 botanical description of it till 1887-8 (" Key to Sys. of 

 Viet. Plants," p. 236). 



Maiden, in his " Critical Revision of Genus Eucalyp 

 tus " (1905) synonymises E. fastigata, Deane and Maiden 

 (Proc. Linn. Soc. N.S.W. 1895), under this species. 



^Bf marks. Hooker, in his " Flora Tasmanise," under 

 " E. gigantea," gives a composite description covering 

 three species of Eucalyptus, and this is one of them (the 

 " Swamp Gum "), the other two being E. obliqua (the 

 " Stringy-bark ") and E . Delegatensis (the " Gum-topped 

 Stringy-bark "). 



This tree is found to occur in Tasmania in similar situ- 

 ations and gregarious with E . obliqua, as on the mainland 

 in Victoria, and is one of the trees referred to by Hooker 

 (loc. cit.) when he states: "This forms a gigantic tree; 

 and specimens have been felled in the valleys at the base 

 of Mt. Wellington 300 feet high and 100 feet in girth." 

 E '. Delegatensis does not occur in the valleys at the base 

 o" Mt. Wellington. 



